Refrigerator shelf



FIG. 1 is a front view of a refrigerator shelf, showing my design; and

FIG. 2 is a rear view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a bottom view thereof.

FIG. 6 is a top front right perspective view thereof; and,

FIG. 7 is a bottom rear left perspective view thereof. 

The ornamental design for a refrigerator shelf, as shown and described. 